^mine looks like that, but I have no supports and it's half as long. I need to build an in run so i can actually use it, but my parents are being dumb and won't let me build the inrun, so i have a rail, sitting there, doing nothing in my garage.
we've made over 100 feet of rails and boxes. It's easy. Also, make that your project in Woods, Shop, or tech Ed, whatever u call it. My friend is making a rollercoaster box in woods, and if he has time, a rainbow box too. (has half the school year for it)